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Why Mapper runs in heavy weight process and not in a thread in MapReduce?
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What is the fundamental difference between a MapReduce InputSplit and HDFS block?
How to set the number of reducers?
Describe what happens to a mapreduce job from submission to output?
Why is output file name in Hadoop MapReduce part-r-00000?
Map reduce jobs take too long. What can be done to improve the performance of the cluster?
What is identity mapper and identity reducer?
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What does conf.setmapper class do?
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What is Combiner in MapReduce?
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